Analysis and examination point: the change of German territory. The key to solve this problem lies in understanding the historical facts of Germany's division and reunification and the changes in the pattern of international relations in Europe. Figure 1 and 1876 The establishment of the Austro-Hungarian Empire. It disintegrated after World War I and the territory of Poland expanded after World War II. In Figure ③, the territory of Germany includes Austria, which was annexed by Germany after 1938. In Figure ④, Prussia's presence in the Middle East was formed after World War I and the victorious countries re-divided German territory. So the answer is C.